Remove Duplicate refreshToken Field from User Model

[zaibamachhaliya]

Description

The User model has refreshToken field defined twice, causing confusion and potential save errors.

Issues Found

1. Duplicate Field Definition - refreshToken defined on line 52 and line 70
2. No Refresh Token Expiry - Refresh tokens never expire
3. No Cleanup - Old refresh tokens not cleared

Expected Outcome

✅ Remove duplicate refreshToken field
✅ Add refreshTokenExpiry field
✅ Add method to clear refresh token

[zaibamachhaliya]

hi please assign this issue to me!

[Sairaj2033]

Hi! I'd like to work on this issue.

I noticed the duplicate refreshToken field in the User model, and I'd like to fix it by:

• Removing the duplicate refreshToken field
• Adding a refreshTokenExpiry field
• Implementing a method to clear expired/old refresh tokens

Please assign this issue to me if it's available. Thank you!